Performance of non-offset and 10° offset 18/0 circle hooks in the United states pelagic longline fishery. Rice, P., H., Serafy, J., E., Snodgrass, D., & Prince, E., D. Bulletin of Marine Science, 88(3):571-587, 7, 2012. ![Performance of non-offset and 10° offset 18/0 circle hooks in the United states pelagic longline fishery [pdf]](https://bibbase.org/img/filetypes/pdf.svg "pdf")
Paper doi abstract bibtex Industry standard fishing hooks used prior to 2004 during US commercial
pelagic longline (PLL) fishing were the 8/0-10/0 J-hooks with a 20
degrees-25 degrees offset-a lateral deviation of the hook point relative
to the hook shaft. However, federal regulations enacted in 2004 require
the US PLL industry to employ circle hooks allowing up to 10 degrees
offset during fishing operations. Until recently, there have been no
studies directly comparing the performance of non-offset and 10 degrees
offset circle hooks in commercial PLL applications. Our study alternated
non-offset and 10 degrees offset circle hooks along the gear length on
individual PLL deployments in the western North Atlantic, Gulf of
Mexico, and Windward Passage in the Caribbean Sea. The study compared
the relative performance of both hook types in terms of: (1) catch
rates, (2) percent mortality, and (3) the percentage of deep-hooked
target and bycatch species. For swordfish, Xiphias gladius (Linnaeus,
1758), several experiments indicate: (1) marginally higher catch rates,
(2) significantly lower mortality, and (3) significantly less deep
hooking on non-offset than 100 offset circle hooks. Most of the
performance differences for blue marlin, Makaira nigricans Lacepede,
1802, were insignificant; however, one study produced significantly
higher mortality on 10 degrees offset than non-offset circle hooks. The
present study suggests that, relative to non-offset circle hooks, 10
degrees offset circle hooks may reduce fishing efficiency and can
counteract the conservation benefits commonly associated with circle
hooks (e.g., lower mortality). However, additional research is required
to assess the effects of offset hooks on tunas, billfishes, and
elasmobranchs.
@article{
title = {Performance of non-offset and 10° offset 18/0 circle hooks in the United states pelagic longline fishery},
type = {article},
year = {2012},
pages = {571-587},
volume = {88},
month = {7},
id = {d8cf8613-0a82-3512-8040-27bce2333f01},
created = {2019-09-05T19:09:30.651Z},
file_attached = {true},
profile_id = {9c1a1cb0-c1b7-3e07-a4a9-3deaea66e1b7},
group_id = {c38dcf34-fa27-380f-93ef-2c3ab1ee926b},
last_modified = {2019-10-04T14:14:06.343Z},
read = {false},
starred = {false},
authored = {false},
confirmed = {true},
hidden = {false},
private_publication = {false},
abstract = {Industry standard fishing hooks used prior to 2004 during US commercial
pelagic longline (PLL) fishing were the 8/0-10/0 J-hooks with a 20
degrees-25 degrees offset-a lateral deviation of the hook point relative
to the hook shaft. However, federal regulations enacted in 2004 require
the US PLL industry to employ circle hooks allowing up to 10 degrees
offset during fishing operations. Until recently, there have been no
studies directly comparing the performance of non-offset and 10 degrees
offset circle hooks in commercial PLL applications. Our study alternated
non-offset and 10 degrees offset circle hooks along the gear length on
individual PLL deployments in the western North Atlantic, Gulf of
Mexico, and Windward Passage in the Caribbean Sea. The study compared
the relative performance of both hook types in terms of: (1) catch
rates, (2) percent mortality, and (3) the percentage of deep-hooked
target and bycatch species. For swordfish, Xiphias gladius (Linnaeus,
1758), several experiments indicate: (1) marginally higher catch rates,
(2) significantly lower mortality, and (3) significantly less deep
hooking on non-offset than 100 offset circle hooks. Most of the
performance differences for blue marlin, Makaira nigricans Lacepede,
1802, were insignificant; however, one study produced significantly
higher mortality on 10 degrees offset than non-offset circle hooks. The
present study suggests that, relative to non-offset circle hooks, 10
degrees offset circle hooks may reduce fishing efficiency and can
counteract the conservation benefits commonly associated with circle
hooks (e.g., lower mortality). However, additional research is required
to assess the effects of offset hooks on tunas, billfishes, and
elasmobranchs.},
bibtype = {article},
author = {Rice, Patrick H. and Serafy, Joseph E. and Snodgrass, Derke and Prince, Eric D.},
doi = {10.5343/bms.2011.1095},
journal = {Bulletin of Marine Science},
number = {3}
}
Downloads: 0
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However, federal regulations enacted in 2004 require\nthe US PLL industry to employ circle hooks allowing up to 10 degrees\noffset during fishing operations. Until recently, there have been no\nstudies directly comparing the performance of non-offset and 10 degrees\noffset circle hooks in commercial PLL applications. Our study alternated\nnon-offset and 10 degrees offset circle hooks along the gear length on\nindividual PLL deployments in the western North Atlantic, Gulf of\nMexico, and Windward Passage in the Caribbean Sea. The study compared\nthe relative performance of both hook types in terms of: (1) catch\nrates, (2) percent mortality, and (3) the percentage of deep-hooked\ntarget and bycatch species. For swordfish, Xiphias gladius (Linnaeus,\n1758), several experiments indicate: (1) marginally higher catch rates,\n(2) significantly lower mortality, and (3) significantly less deep\nhooking on non-offset than 100 offset circle hooks. 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However, federal regulations enacted in 2004 require\nthe US PLL industry to employ circle hooks allowing up to 10 degrees\noffset during fishing operations. Until recently, there have been no\nstudies directly comparing the performance of non-offset and 10 degrees\noffset circle hooks in commercial PLL applications. Our study alternated\nnon-offset and 10 degrees offset circle hooks along the gear length on\nindividual PLL deployments in the western North Atlantic, Gulf of\nMexico, and Windward Passage in the Caribbean Sea. The study compared\nthe relative performance of both hook types in terms of: (1) catch\nrates, (2) percent mortality, and (3) the percentage of deep-hooked\ntarget and bycatch species. For swordfish, Xiphias gladius (Linnaeus,\n1758), several experiments indicate: (1) marginally higher catch rates,\n(2) significantly lower mortality, and (3) significantly less deep\nhooking on non-offset than 100 offset circle hooks. 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